Simplify Writing-Mode Related Calculation of Margins

Source/core/rendering/RenderBox.h

Index: Source/core/rendering/RenderBox.h
diff --git a/Source/core/rendering/RenderBox.h b/Source/core/rendering/RenderBox.h
index 11c8a8ca98572323354087b3710408db331d22b9..86b43daf954f01c89133ec5e02e6ab5f1ba3cb0b 100644
--- a/Source/core/rendering/RenderBox.h
+++ b/Source/core/rendering/RenderBox.h
@@ -36,6 +36,7 @@ struct PaintInfo;
 enum SizeType { MainOrPreferredSize, MinSize, MaxSize };
 enum AvailableLogicalHeightType { ExcludeMarginBorderPadding, IncludeMarginBorderPadding };
 enum OverlayScrollbarSizeRelevancy { IgnoreOverlayScrollbarSize, IncludeOverlayScrollbarSize };
+enum MarginDirection { BlockDirection, InlineDirection };
 
 enum ShouldComputePreferred { ComputeActual, ComputePreferred };
 
@@ -385,12 +386,11 @@ public:
         LayoutUnit m_position;
         ComputedMarginValues m_margins;
     };
-    // Resolve auto margins in the inline direction of the containing block so that objects can be pushed to the start, middle or end
+    // Resolve auto margins in the chosen direction of the containing block so that objects can be pushed to the start, middle or end
     // of the containing block.
-    void computeInlineDirectionMargins(RenderBlock* containingBlock, LayoutUnit containerWidth, LayoutUnit childWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd) const;
+    void computeMarginsForDirection(MarginDirection forDirection, const RenderBlock* containingBlock, LayoutUnit containerWidth, LayoutUnit childWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd, Length marginStartLength, Length marginStartEnd) const;
 
     // Used to resolve margins in the containing block's block-flow direction.
-    void computeBlockDirectionMargins(const RenderBlock* containingBlock, LayoutUnit& marginBefore, LayoutUnit& marginAfter) const;
     void computeAndSetBlockDirectionMargins(const RenderBlock* containingBlock);
 
     virtual LayoutUnit offsetFromLogicalTopOfFirstPage() const;